Synonyms|468Antonyms|98|Broader|6Narrower|0Related|413
4
unvaried
4
unyielding(adjective, hard, firm, steady, fixed)
3
ageless(adjective, fixed, lasting, unchanging, permanent)
3
continual(adjective, steady, stable, regular, fixed)
3
equable(adjective, calm, strong, secure, firm)
3
final
3
incommutable
3
inelastic
3
iron(adjective, set, hard, stiff, rigid)
3
long-standing(steady, even, unchanging)
3
methodical(adjective, even, rigid, inflexible, reliable)
3
persevering
3
persisting(adjective, strong, firm, determined, bold)
3
secure(calm, strong, steady, substantial, fixed)
3
settled
3
single-minded(adjective, set, hard, stiff, rigid)
3
steely(adjective, set, hard, stiff, rigid)
3
strong(calm, firm, steady, fixed, even)
3
tenacious
3
unfluctuating(adjective, calm, strong, secure, firm)
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APASmart Define. (2015). immutable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/immutable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immutable thesaurus" https://smartdefine.org/immutable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, immutable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/immutable/thesaurus/synonyms>.
MLASmart Define. "immutable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/immutable/thesaurus/synonyms>